Outer diameter - length - maximum hole, note aperture size C16-24 - maximum hole 6C19-25 - maximum hole 10C25-30 - maximum hole 12C30-35 - maximum hole 16C30-40 - maximum hole 16C32-40- maximum hole 16C40-50 - maximum hole 17C40-56-maximum hole 17C50-51 - maximum hole 20C50-70 - maximum hole 20C63-90 - maximum hole 25 Both ends of the hole diameter can be opened according to the requirements of the processing keyway
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